I had a closer look (listen).

(1) The spelling 'Johnstone' only appears on the LP cover, on the LP itself it is spelled 'Johnston'.

(2) I've listened again to the lyrics and compared them with all versions I have. None of them is similar. Of the perhaps traditional ones in particular it is neither similar to the version in Palmer's book about English Country songs, nor to the version in McColls book of Travellers songs nor to the version in 'Marrowbones' (from the Sharp House collection).

I think I could transcribe the lyrics if that's what you want. However, I understand that you are more interested in where this particular version comes from. I'd like to know that too.

Wolfgang